The unemployed, drug-addled daughter of real-estate mogul Peter Kalikow was arrested for dealing heroin in The Bronx with her boyfriend, according to a criminal complaint.

Kathryn Kalikow, 27, and junkie boyfriend Brian Whalen, 28, went to make the sale in Fordham Sunday night after arranging it on Craigslist — and were busted because their buyer was an undercover police officer conducting a sting, according to court records.

The arrest sent her father, Peter Kalikow — a former MTA Chairman who is worth nearly $500 million — reeling.

“Mary and I are very concerned and all we are concentrating on now is helping our daughter,” Peter Kalikow said in a statement, referring to his wife.

The young couple — who met while attending Vassar College — allegedly offered drugs in a Craigslist ad that caught the attention of the undercover officer.

“High quality diesel pain relief available. Discreet & professional. No games; will only reply to likeminded individuals. Email name and number for response. Stamps, diesel, H train, dope, bundles, tickets, dog food,” the ad read, using coded words for heroin, according to the complaint.

Kathryn Kalikow and Whalen arrived at the meeting point in a blue Volkswagen and entered a restaurant before returning to the car, according to court records.

Whalen texted the undercover client that they were ready to make the pre-arranged $440 sale, according to the complaint.

When confronted by cops, Whalen said he didn’t have anything on him. Kalikow copped to holding the heroin when confronted by a second officer.

“Yes I have drugs. He’s my boyfriend, I was holding on to it for him,” she said, according to court records.

She handed him three plastic sacks stuffed with 10 small plastic bags of heroin each, according to the court papers.

Both Kalikow — whose father once owned The Post — and Whalen admitted to having drug addictions, prosecutors said.

“It was my idea to go on Craigslist and post the ad. I need treatment. I am a heroin addict, and to afford the drug I agreed to sell some . . . on consignment for the person I buy from,” Whalen told cops, according to court records.

Kathryn Kalikow appeared dazed and disheveled at her arraignment in Bronx Criminal Court yesterday.

“I have a problem,” she told cops, prosecutors said. “I need help.”

She and Whalen were each charged with felony drug possession with intent to sell and were released on their own recognizance. Their attorneys said they would enter treatment programs.

“This family has been dedicated to this city,” Kathryn Kalikow’s lawyer, Stacy Richman, said arguing for her release.